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Manually Switch Redis Primary/Standby

In the Redis cache service, manually switching the primary/standby roles ensures continuous system operation when the primary node fails or requires maintenance. This article describes how to manually switch the primary/standby roles of Redis through the UI, and discusses the use cases and limitations.

Use Cases

  1. Failure recovery: When the primary node fails, the standby node can be promoted to the new primary node to ensure service continuity.
  2. Load balancing: Under high load, switching the primary/standby roles can distribute requests and improve the response capability of the system.
  3. Test environment: In development and test environments, manually switching the primary/standby roles helps developers verify the fault tolerance and data consistency of the system.

Cluster Mode

  1. Click the name of the target Redis instance to enter its details page.
  2. In the Pod list of the instance that requires a primary/standby switchover, click the icon in front of the shard name to expand all nodes under the current shard.

  3. To switch the primary/standby roles of the nodes in a shard, click the Switch Primary/Standby icon after the shard to promote the standby node to the primary node.

    switch-role

  4. Expand the drop-down list of standby nodes to specify the standby node to be promoted to the primary node.

    switch-role

Sentinel Mode

  1. Click the name of the target Redis instance to enter its details page.

  2. In the upper right corner of the overview page, click Switch Primary/Standby.

    switch-role

  3. Expand the drop-down list of standby nodes to specify the standby node to be promoted to the primary node.

    switch-role

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